问题:

你想通过数据集合动态的生成交替背景色的列表.

方法:

Give templetor access to the int built-in and use modulo to test.

code.py

web.template.Template.globals['int'] = int

template.html

<ul>
$var i: 0
$for track in tracks:
    $var i: ${int(self.i) + 1}
    <li class="
    $if int(self.i) % 2:
        odd
    $else:
        even
    ">$track.title</li>
</ul>

New Templetor

In the new implementation of templetor (which will be the default when version .3 is released), within any template loop you have access to a $loop variable. This works like so:

<ul>
$for foo in foos:
    <li class="$loop.parity">
    $foo
    </li>
</ul>

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